Used for gypsum board control cutting. Suitable for materials with a thickness of no more than 1 inch. Compatible with for all spiral saw electric tools. GP16 1/8-inch (about 1.2 cm) dry wall guide point cutting Zipbit is designed for durability and performance. It is very suitable to control the dry wall cutting with for screw saw electric tools.The guide point pen tip can track around the export box and lighten up.The zipper drill allows the thickness of the cutting thickness of not more than 1 inches (about 2.5 cm). Suitable for spiral saw electric tools. Handle diameter:3.2 x 20.26 cm Colour:Silver Material:High Speed Steel Package Contents: 1set * brocas para drywall(16pcs) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.