Designed for use on slotted retaining rings found on motorcycle suspensions and on other machinery. The wrenches can be interchanged with either Hook or Pin jaw. Ideal for adjusting collars, lock nut rings and bearings. Made from Cr-Mo Steel for superior strength. Specifications: Overall Length (mm): 175, 200, 290. Span Diameter (mm): 35 - 60, 60 - 90, 90 - 120. Hook Depth (mm): 2.8, 3, 4. Hook Thickness (mm): 5, 10, 12. Pin Sizes (diameter x length mm): 7.9 x 8, 6 x 3.8, 6 x 7.9, 5 x4, 4 x 4.