ARKSEN 3PC Earth Auger Digger Post Hole Extension, 8", 12", 20" inch Set, 3/4" Shaft Extension fits between powerhead and auger Compatible to 3/4" Shaft; Output shafts to heavy wall tubing to increase strenght and reduce weight Fits the ARKSEN auger powerheads ASIN (B01GSFVLXK) Includes 3 Sizes: 8", 12", 20" inch Die Cast Construction; Output shafts to heavy wall tubing to increase strength and reduce weight