Van Alstine, GV-1000 OTR Tire Groover: is a newly redesigned groover, with 4 heat settings and now, infinite adjustment in each setting. The head has also been redesigned to allow infinite adjustment in all directions and there are two sets of clamps. The first set of clamps are designed for the shorter GF and HGF-RB blades.  The second set of clamps are designed for the taller SHGF-RB blades.