ITEM NAME:3PCS 4-12/20/32mm HSS 4241 Titanium Nitride Cutter Coated Step Shank Dril ESQ Descriptio n Description: Name: hex handle straight groove step drill Pagoda drill twist drill plate hole opener 4-32,4-20,4-12 Dimensions: shaft 6.35mm, length is 77+24.6mm, 52+22mm, 42+24.7mm Weight: 200g Color: gold Material: metal + plastic 1. It is recommended to drill a workpiece with a stainless steel hardness of 25Â ° or less. 2. Recommended speed 250-400. 3. Titanium plating material: It adopts advanced titanium-plated gold technology for surface treatment to improve the anti-oxidation and corrosion resistance of the drill bit. Product Includes: 3pcs (4-12, 4-20, 4-32) We offer you what you need! Conical drill bit 3pcs: 4-32, 4-20, 4-12.Conical drill bit 3pcs: 4-32, 4-20, 4-12. We'd like to settle any problem in a friendly manner. We want to make sure you are happy with our item. Goods without RMA number will NOT be accepted.