ITEM NAME:5PCS/Set 4/5/6/8/10mm Straight Shank M35 Cobalt High Speed Steel HSS Twist X1L5 5PCS/Set 4/5/6/8/10mm Straight Shank M35 Cobalt High Speed Steel HSS Twist X1L5 Straight round shank. Smooth surface to reduce friction, sharp blade for fast drilling hole. Wear-resistant with long service time. which meets your various needs that does a good job in drilling metals, especially suitable for those high hardness steel such as stainless steel. Perfect for drilling high hardness metals: Iron, Aluminum, Copper, Steel esp.stainless steel. Suit to use with hand drill chuck, bench drill, radial drill etc. Surface Treatment: Bit Baked Yellow colour: Photo Color Material: M35 High speed steel + Cobalt size: Drill Bits Size: 4mm,5mm,6mm,8mm,10mm Package Contents: 5 * Twist Drill Bit Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..Material: M35 High speed steel + Cobalt. Straight round shank. 5 Twist Drill Bit. Smooth surface to reduce friction, sharp blade for fast drilling hole. Suit to use with hand drill chuck, bench drill, radial drill etc.