Specification : Head Diameter*Overall Heigh: 12*40MM; 16*45MM; 19MM*45MM; Hex Shank Diameter: 6.35mm(1/4 inch). 100% Brand new and high quality countersink drill bit made of high carbon steel with fully heat-treated and titanium coating to ensure longevity and high wear resistance. Multiple Application: 5 flute 90 segree chamfering countersink bits are ideal for work where high performance and accuracy are needed. Excellent for cutting wood,soft metal,plastic in seconds. It's universal hex handle for the most drill driver tool. For example: Electric Drills, Bench Drills, and Rechargeable Drills etc. Color/Finshed : Silver & Black; Diameter : 12/16/19MM; Universal Hex Shank: 6.35mm/1/4"; Surface Treatment: Blackening treatment; Material:High Carbon Steel; Package Content:1. 3 * 13/16/19MM.Items from Sheng Xinshun's shop