General description Made of alloy steel and fully heat-treated, this 13-piece spade drill bit set offers superior durability and hardness compared to carbon steel. The polished heads ensure a long service life and high wear resistance. The set includes a variety of sizes, making it versatile for different drilling needs. Technical specifications Material: Alloy steel Sizes: 1/4 inch, 5/16 inch, 3/8 inch, 1/2 inch, 9/16 inch, 5/8 inch, 3/4 inch, 7/8 inch, 1 inch, 1-1/8 inch, 1-1/4 inch, 1-3/8 inch, 1-1/2 inch Hex shank size: 1/4 inch Measurement allowed error: +/- 1-3 cm Compatibility and accessories Compatible with most drill tools on the market Includes a storage box for easy organization Usage Precision drilling in wood, fiberglass, plastic, and PVC (polyvinyl chloride) High-quality double-sided cutting spurs grip the wood and carve it away, creating clean holes and reducing breakage Other information Color: Silver Note: Light reflection and different displays may cause the color of