Groover cuts clean, smooth professional control joints every time. The rivetless design allows for sharp, clean joints without mussing the top of the slab. Made from hand polished stainless steel that won't rust for an extra smooth working surface. The rivet-free design combines an 8 in W groover base, top plate and bracket base to be electronically welded together providing strength to move through concrete. Both sides of the groover are curved up to avoid any gouging while in use. The tool creates a groove in wet cement to control expansion and contraction and relieve stress points. This 8 x 6 in groover features a bit that has a 1/4 in radius and is 3/4 in D. The 1-piece formed groove provide a smooth professional finish. The closed end groover bit eliminates possible build up within the tool. 4 rivets secure the bracket base to the groover. The bracket is designed to adjust 180 deg to go back and forth along a job. The toothed bracket tightens to set and keep a desired angle. The bracket and socket is made of cast aluminum for long wearing use. Use with threaded bull float extension handles, sold separately. Use with a threaded bull float handle adapter for more versatility. Proudly made in the USA. Kraft Tool Co.® has been an American manufacturer of quality hand tools for the concrete, masonry, asphalt, plaster, drywall, tile, floor covering and leveling trades for over 35 years.