All-steel construction. To be used for drilling in soil only. No. JJB-9: Bulb planter drills holes 1-3/4" in diameter and up to 6" deep, fits 3/8" or 1/2" drills No. JBB-24: 24" long bulb planter drills holes 3-1/4" in diameter and up to 8" deep, fits any 3/8" or 1/2" electric or cordless drill No. JB-24: Bulb planter drills holes 2-3/4" in diameter and up to 8" deep, fits 3/8" or 1/2" drills No. JR-18: Earth auger drills holes 1-1/4" in diameter and up to 18" deep, fits 1/4" or larger drill No. JL-24: Earth auger drills holes 1-3/4" in diameter and up to 24" deep, fits 3/8" or 1/2" drills