1. No pilot hole required2. The big drill has 3 side handles3. Automatically support the hole when drilling4. High-speed steel, sturdy and durable5. Widely used to cut holes in various materials such as steel, wood, thin iron, aluminum alloy, insulating board, PVC board, etc.6. Specifications:(1) 4-32mm (4,6,8,10,12,14,16,18,20,22,24,26,28,30,32 mm) 10mm shank(2) 6-30mm (6,8,10,12,14,16,18,20,22,24,26,28,30mm) 10mm handle(3) 4-20mm (4,6,8,10,12,14,16,18,20 mm) 8mm handle(4) 4-12mm (4, 6, 8, 10, 12 mm) 6mm shankPacking list:The 3-piece set contains:4-12mm x 14-20mm x 14-32mm x 1Specification: Package Weight One Package Weight 0.20kgs / 0.43lb One Package Size 18cm * 15cm * 8cm / 7.09inch * 5.91inch * 3.15inch Qty per Carton 154 Carton Weight 30.00kgs / 66.14lb Carton Size 50cm * 50cm * 60cm / 19.69inch * 19.69inch * 23.62inch Loading Container 20GP: 177 cartons * 154 pcs = 27258 pcs40HQ: 412 cartons * 154 pcs = 63448 pcs