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KONGZIR Drill 3pcs Nitrogen Step Drill Bit Set 3/16-1/2 1/4-3/4 3/16-7/8 Drill Accessories - -. Durable and practical. 。 Application Material: Wood,plastic,Aluminum plate etc. 。 Suitable for DIY, Home and General Building/Engineering Using. 。 Automatically Deburrs for A Clean and Hole 。 If you have any questions, our customer service will reply to you within 24 hours. 。 Due to manual measurements, please allow a 0.1-0.5 inch difference. (1 inch = 2.54 cm)。Used in sandpaper, polishing paper, sanding discs, cloth-based abrasives or rotating tools.。Quick change, easy to lock and release the drill bit.。Enhanced control of sanding and grinding applications.。Specification:。Material: HSS。Type:3/16-1/2,1/4-3/4,3/16-7/8。Total quantity: 3pcs。Size。Type:3/16-1/2。Diameter of Head:12mm/0.47''。Diameter of Shank:6mm/0.23''。Length of Blade:35mm/1.37''。Total Length:60mm/2.36。Type:1/4-3/4。Diameter of Head:20mm/0.78''。Diameter of Shank:10mm/0.39''。Length of Blade:50mm/1.96''。Total Length:75mm/2.95''。Type:3/16-7/8。Diameter of Head:20mm/0.78''。Diameter of Shank:10mm/0.39''。Length of Blade:55mm/2.16''。Total Length:80mm/3.14''。Package Included:。3 x Step Drill。If you have any questions, our customer service will reply to you within 24 hours.。