Features: Brand new and high quality Made from stainless steel, corrosion-resistant, durable. After heat treatments, quenching and tempering, the drill sleeve is very wear-resistant after hardening. Compact design and easy to carry, it is a DIY tool for family carpentry. Suitable for three-in-one punching machine, oblique punching machine, etc. Various specifications can be provided to meet the drilling requirements of different bits. The drill sleeve can solve the problem of drift and shaking of the drill bit during drilling, which makes the punching more accurate and saves effort and worry at the same time. Specifications: Material:Stainless Steel Type:Drill Sleeve/Knurling Drill Sleeve:6mm 8mm 10mm 12mm 15mm Knurling:3mm 4mm 5mm 6mm 7mm 8mm 9mm10mm Package Includes: 2 Optional Package: Package 1 Include:5Pcs Drill Sleeve Package 2 Include:8Pcs Drill Sleeve note: 1.Please allow 1-2cm 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.