Features: Silver black automatic center punch Spring material: stainless steel shell material: high carbon steel Product length: 128/155mm The center punch has an all-steel body, a knurled finger grip and a rust-proof silver black oxide coating. The body diameter is 1/2 inch Automatic punching depth: central punching can be set for repetitive work Product use: Marking and positioning, breaking glass, emergency survival tool. Package Includes: 1x Punch Locator Specifications: Material: Steel Color :Silver Black Size1: Approx.128mm/5.03inch Size2: Approx.155mm/6.1inch 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.