THIS IS AN IMPROVED VERSION OF THE ALL10270 GROOVER WITH A REDESIGNED HEAD FOR BETTER VISIBILITY WHEN GROOVING TIRES. GROOVER INCLUDES 2 EACH OF THE FOLLOWING BLADES: ALL10272 #4 FLAT BLADES ALL10273 #6 FLAT BLADES ALL10274 #8 FLAT BLADES ALL10275 #10 FLAT BLADES