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Allen 40mm dynamic blocks are made from high-strength, lightweight glass-loaded nylon and feature dynamic bearings. The result is a high-performance block range suitable for keelboats and dinghies.
Dynamic Bearings - Twin rows of stainless steel ball bearings running on a stainless steel rail provide superior rolling speeds and durability when compared to plastic alternatives.
Swivel Shackle Attachment - Double, triple, and quadruple sheave variations all come with a lockable swivel shackle attachment. The shackle can be locked in 90-degree orientations. Alternatively, remove the shackle lock and allow the block to rotate freely.
Adjustable Cleat Arms - Single, double, and triple sheave options are available with aluminium ball-bearing cam cleats mounted via an adjustable arm. The arm can be adjusted to suit your sheeting angle by simply loosening the nut and bolt through the centre of the block, loosening the side plates, and retightening everything at the required angle.