1. Easy to start drilling without pre-drilling. Drilling speed is fast and friction is very low.2. Universally applicable to various metals, plexiglass, and hard plastics.3. Very suitable for home DIY and general construction projects.4. Use with needle vise or low-speed electric drill (not suitable for impact drill).5. Material: high speed steel6. Dimensions:16 x 1.5mm16 x 2mm15 x 2.5mm10 x 3mm10 x 3.2mm8 x 3.5mm8 x 4mm3 x 4.5mm3 x 5mm2 x 5.5mm2 x 6mm2 x 6.5mm2 x 8mm2 x 10mmPackage Included:99 pieces of twist drill bitsSpecification: Package Weight One Package Weight 0.68kgs / 1.51lb One Package Size 22cm * 20cm * 5cm / 8.66inch * 7.87inch * 1.97inch Qty per Carton 44 Carton Weight 30.00kgs / 66.14lb Carton Size 50cm * 50cm * 60cm / 19.69inch * 19.69inch * 23.62inch Loading Container 20GP: 177 cartons * 44 pcs = 7788 pcs40HQ: 412 cartons * 44 pcs = 18128 pcs