Concrete fishing Sinker Mold Grippa 400g | SAF Concrete Series

Product detailed description

Concrete fishing Sinker Mold Grippa 400g | SAF Concrete Series is designed for repeated production of very heavy concrete fishing sinkers, with an emphasis on shape accuracy, working stability and reliable use in truly demanding conditions. The mold is 3D printed from PETG material and dimensioned for a concrete mix with a density of 2300 kg/m³.

2 casting cavities = efficient production of extra-heavy sinkers
The 400g version features two casting cavities, which makes practical sense for very heavy sinkers. The mold remains robust, easy to handle and suitable for repeated production without unnecessary compromises in body strength.

Grippa 400g: an anchor-style version for bait boat use, strong current and demanding conditions
This weight is not designed as a standard sinker for regular casting. It makes the most sense where you need to keep the rig anchored as firmly as possible – during bait boat placement, in strong current, on sloping bottoms, bars, drop-offs or other difficult spots where lighter sinkers are more likely to shift or roll away.

Why the Grippa shape works in harsher conditions
The Grippa shape is designed to help the sinker hold its position even where the bottom is uneven or where current is putting significant pressure on the rig. The studs on the body improve bottom contact, the flatter profile supports stability, and the overall design helps reduce unwanted movement or rolling when used correctly. With a weight this heavy, that design logic becomes even more important.

Robust construction for accurate castings
The mold body is designed as reinforced and shape-stable, helping to prevent unwanted flexing or deformation during normal fixing and filling. This is essential for keeping the final concrete sinker consistent in both shape and dimensions.

Corner holes = flexible fixing options
The mold includes prepared corner holes / pass-through points for easy assembly with bolts (for example with wing nuts or star knobs). If you prefer a different workflow, the mold can also be secured with suitable clamps. When fixed properly, the mold keeps its shape and helps produce a clean, repeatable casting result.

Spring insert or 1 mm stainless steel wire: choose the attachment option you need
The mold is designed to work well with a stainless steel spring insert No. 1, which is placed into the mold before pouring the mix. After the concrete is poured and cured, it creates a firm anchor point in the finished sinker. For larger molds or more specific attachment requirements, the spring insert can also be replaced with a properly shaped stainless steel wire with a diameter of 1 mm.

Recommendation before pouring the mix
Before filling the mold, we recommend applying a light release layer to the inner surfaces so the finished sinker can be removed more easily. In practice, anglers often use a thin film of vegetable oil or a light spray oil (for example a WD-40 type spray). Apply only a thin layer to avoid affecting surface detail.

400g weight reference note
The stated 400g weight is based on a concrete mix with a density of 2300 kg/m³. Final weight may vary slightly depending on the exact mix recipe, water content, compaction and curing process. We recommend verifying the final weight with a test casting.

SAF Concrete Series molds are a solid choice for anglers who want full control over very heavy concrete sinker production — from mix selection to final colour and surface finish. The 400g version makes the most sense where maximum rig stability and strong anchoring are needed in difficult conditions. Custom weight versions are available on request, depending on your specific requirements.

→ For all detailed technical information, see the Parameters section below.

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