The Allen 30mm Dynamic Block with Swivel Fork is built with a unique swivelling fork head that includes a threaded pin. With the ability to articulate on the attachment fitting, this block is versatile for a variety of uses. The patented bearing system features twin rows of stainless-steel ball bearings on a stainless-steel rail, providing superior load-carrying ability and durability. The large central rivet found on the 20 & 30mm blocks also decreases weight and offers a rope-friendly attachment, perfect for use in a cascade system.