Dasqua 220 lbs power pull 355mm arm length magnetic Base. New locking mechanism style provides for a super strong arm lock. Tight locking force guarantees long life and firm positioning. All parts are made with hardened high class steel with an HRC of 58 degree +. Inner structure is made of bearing steel providing more wear-resistance and long service life. Main parts are generated on CNC machines for an extremely accurate and highly precise fit. The tightening knob is ergonomically designed for a more comfortable grip. Flexible and strong rotary joints produce smooth adjustments in any direction or location. Three clamping holes makes this base suitable metric and inch dial indicators. Clamping holes are 6mm, 8mm and 3/8". There is a dovetail groove for test indicators.