Features: High quality heat treated steel, durability, has high hardness, not easy to wear. Approx 48mm/1.89in screwdriver bit, automatically sets screws to proper depth in drywall-. These are designed to be used with any power drill or cordless-drill 1/4 hex shank Includes depth stop to limit screw penetration and damage to board. Suitable for plasterboard screws locating and as drywal dimpler- bits,can matching with any power drill and cordless- drill for normal usage Specifications: Product Name: Single Cross Screwdriver Bits Material: Tool Steel + Magnetic Color:Red+Grey Shank Diameter : 1/4Inch Length :approx 48mm/1.89in Quantity :15Pc Note: Please allow 0-1cm error due to manual measurement. please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1PC Cross Screwdriver Bits