Used for gypsum board control cutting. Suitable for materials with a thickness of no more than 1 inch. Compatible with all spiral saw electric tools. GP16 1/8-inch (approximately 1.2 cm) drywall guide point cutting Zipbit is designed for durability and performance. Ideal for controlling drywall cutting with screw saw electric tools. The guide point tip can track around outlet boxes and mark precise lines. The drill bit allows cutting through materials up to 1 inch (approximately 2.5 cm) thick. Suitable for use with spiral saw electric tools. Handle dimensions: 3.2 x 20.26 cm. Color: Silver. Material: High Speed Steel. Package includes: 1 set of drywall drill bits (16 pieces). Product only includes items listed; other accessories are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement tolerance: +/- 1-3 cm.