名称：三角柄英制阶梯钻3PC切削材料：薄铁板、铝材、绝缘板、PVC板木材厚度在5mm内。用一只钻头能够打出各种规格的孔眼。 材质：高速钢4241（适合使用于硬度25°以下的工件，如碳钢）       表面处理:镀钛包装：塑料袋产品规格：3/16-1/2''                                    6阶:3/16''（4.76mm), 1/4''(6.35mm）, 5/16''(7.94mm), 3/8''(10.35mm), 7/16''(11.11mm),  1/2''(12.7mm) 1/4-3/4'': 9阶:1/4''(6.35mm)  5/16''(7.94mm),  3/8''(10.35mm), 7/16''(11.11mm),1/2''(12.7mm）,9/16''(14.28mm), 5/8''(15.88mm), 11/16''(17.46mm), 3/4''(19.05mm)  1/8-1/2'' :13阶:1/8''（3.18mm), 5/32''(3.97mm), 3/16''（4.76mm), 7/32'',(5.56mm)1/4'' 9/32''(7.14mm), 5/16''(7.94mm),  11/32''(8.73mm),  3/8''(9.53mm), 13/32''(10.32mm),7/16''(11.11mm),15/32''(11.91mm),1/2''(12