Cordless Rotary tool GCU 18V-30, The GCU 18V-30 gets all-day performance to cut over 100 meters of 12 mm drywall with a 1/8 (3.17 mm) bit on one ProCORE18V 4.0Ah battery thanks to the powerful brushless motor spinning at 30,000 rpm. The compact, lightweight design and a dust-sealed switch ensure comfortable gripping in all positions, keeping you fatigue-free for longer and extending the lifetime of the tool. The tool is designed for flush cutting drywall around windows, doors, access panels, and electrical outlets. It also cuts plywood, OSB, and ceiling tiles and is compatible with 1/8'', 5/32'', and 1/4'' (3.17 mm, 3.96 mm, and 6.35 mm) collets.