The Tii design incorporates a special stainless steel insert in the head which improves the stability and durability of the blocks.

Allen 50mm Dynamic Blocks utilise our patented Dynamic bearing technology, the high quality stainless steel ball bearings running on stainless steel rails provides unsurpassed performance under load. The large central hole for tie-on becket requirements gives this block range a distinctive style and significant weight reduction and is available with a variety of accessories. Suitable for numerous demanding applications on boats, including Catamarans and Keelboats, the multi blocks provides great free running performance under load.