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Antal Stopper Deck Blocks sheaves are made of high strength resin, fitted with composite fibre bush and side ball bearings. No maintenance or lubrication is required.

The machined side plates are made of high strength alloy, hard black anodised for wear and corrosion proofing and with all the edges smoothed off.

The aluminium locking cam is fitted on an automatic opening spring; relaxing the sheet is sufficient to open the jammer.

Compact design with lever fully concealed within the side plates and with recessed fasteners.

NOTE: The cam cannot be locked under high loads. Its intended to hold the line temporarily and not under heavy loads.