Klein Tools Lineman's Wrenches are forged from special bar steel and heat-treated for durability and long life. These wrenches are designed for use on heavy three-bolt guy clamps where clearance is limited. Each end has two different size openings, plus a hole at the larger end for turning-in standard pole steps. #3146 Features 29/32 in. and 1-3/32 in. openings on the large end Features 5/8 in. and 13/16 in. openings on the small end Special bar steel construction with dark blue painted finish #3146A Features 1-1/16 in. and 1-5/16 in. openings on the large end Features 5/8 in. and 7/8 in. openings on the small end Special bar steel construction with dark blue painted finish #3146B Features 1-1/16 in. and 1-3/16 in. openings on large end Features 11/16 in. and 7/8 in. openings on the small end 13 in wrench is ideal for bell system type applications