Features: brand new and high quality Drilling should be gentle, especially at the beginning of the drilling and when it is about to drill through Material: hard alloy, strong and durable Operation steps: 1. Install the drill bit into the limit ring 2. Insert expansion bolts into the holes 3. Install the bit and screws 4. Drive the screw into the expansion bolt to complete Suitable for pis-tol drill/lithium electric drill/air drill The tor-que of the rechargeable drill below 24v is too low, it is not recommended to apply Specifications: Material:Cemented Carbide Color :Yellow/Orange Size1: Approx.39.5mm/1.55inch Size2: Approx.6.35x101x4.5mm/0.25x3.97x0.17inch Size3: Approx.10x65x6.35mm/0.39x2.55x0.25inch Size4: Approx.13x7.8mm/0.51x0.30inch Note: 1.Please allow 1-2mm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 8 PcsxSmall Goldfish Expansion Nails 1Pc x Glass Hole Drill 1Pcx 65mm Bit 1Pc xWrench 1Pc xDrill Stop Ring