Features: 3Pcs Self Centering Hinges Hardware Drill Bit Set 3/32", 7/64", 1/8" . Drill bush for precise positioning, will not move. Carbon steel body , rustproof and excellent for use. Sawdust will be automatically discharged from the top of the hole on both side, without drill blocked. Never missing the center of the hole again, references from the Hinges bevels. Unique designs and perfect punch effect. Applicable for the installation of the door Hinges. Easy to use and install, change bit fast which -handed load and release. Drill bit are surrounded by spring loaded guides that have a casement to show the drill bit depth while making adjustments. Specifications: Component:Carbon Steel Bit Holder Length:Approx.60mm/2.36'' Package Includes: 3Pcs Self Centering Drill Bit 1Piece Bit Holder note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.