Walking Airplane Groover – 8" x 8" Square End, 3/4" Double Bit (No Bracket)8 x 8 Airplane Groover Double Bit has 3 4 inch bit depth, 7 8 inch bit width, and made of high quality cast aluminum with a broken in face. Airplane groover with big bit no bracket. 8" x 8" Walking Airplane Groover Square End 3 4" Double Bit, No Bracket This Walking Airplane Groover measures 8" x 8" with a square end and 3 4" double bit, offered without bracket. Perfect for small to mid size concrete jobs requiring accuracy and durability.