Hamskea GEN2PRO Third Axis Sight Level Black Built-in string groove and circular turret level;Works for fixed pins or slider sights;Capable of opening up to accept sight or riser widths up to 1.3";String groove for leveling bow in a bow vice;Multiple mounting options: riser, sight dovetail, sight rail, stringtable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; } Item Category Code: 3500 Product Group Code: 3500D Inactive: No