Description: Widely used to cut holes in a variety of material like steel, wood, thin iron, aluminum alloy, insulation boards, PVC sheet, ect Made from high quality HSS steel Titanium coated to reduce friction and heat and increased service life The ladder of its unique structure, a bit can open a variety of specifications of aperture Deburring, chamfering, elliptic hole enlargement, twist drill, drill, bench drill Specification: Material: HSS Color: Black 4-12mm (4,6,8,10,12mm): Shank: Approx. 21 x 6mm/ 0.93x 0.24inch 4-20mm (4,6,8,10,12,14,16,18,20mm): Shank: Approx. 22 x 8mm/ 0.87x 0.31inch 4-32mm (4,6,8,10,12,14,16,18,20,22,24,26,28,30,32mm): Shank: Approx. 23 x 10mm/ 0.91x 0.39inch Package Includes: 3 Pieces Step Drill Bit Set( 4-12mm, 4-20mm, 4-32mm) Note: Please allow 1-2mm differs due to manual measurement, thanks. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand, Thank you!
