Narex 3 Piece Slotted Gunsmith Plane Adjusting Screwdriver Set 3/16, 1/4, 5/16 886905-08 Precision manufactured by a highly respected tool manufacturer in the Czech Republic. 3 piece set containing 3/16, 1/4" and 5/16 Handles made from European stained Beech wood with a solid brass ferules Screwdriver blades are constructed of Chromium-Vanadium steel alloy. Tips feature a parallel grind for a more precise fit in screw slots minimizing damage to screw heads