Description: Adjustable Screw Depth Holder with 12pcs PH2 Screwdriver Bits For Woodworking.    Features:  1. Screw regulator for gypsum board, board, floor, plywood, density board.  2. Various specifications, wide application, chromium vanadium steel materials, long service life.  3. Applicable to batch head of 6.35mm specification, the built-in magnet is easy to use.  4. Knurled non-slip design, not easy to slip, safe and convenient to use.  5. It is easy to use the expansion spring and easy to use.  6. According to the professional design of drywall screws for mounting gypsum board, Ph2 batch     head can be replaced in the batch head slot, and the repeated use can save construction cost.  7. The double aluminum outer ring is adjusted to prevent excessive force and gypsum board from     attacking the drywall nail, and to reduce the surface mud repair.    Specification: Material alloy;  Batch header interface 6.35mm;  Batch of head length 25 mm;  Length of limiter 65mm;  Scope of application  woodworking;    Package Included:  1 x Limiter;  12 x Screwdriver bits