●Using high-grade material, stable drilling without burdening and chattering is possible.●Work material: Iron plate(strength of 900N/[[MM2]] or less), brass, aluminum, plastic(up to 4mm)●Step Width (mm):4●Number of Stages (stage):9●Shank Diameter:3/8●Drilling dimension:1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4●No Coating●Cobalt High Speed Steel
