Vertical Mulching Bits 1 - 1/14" approx 34" long) and the other is approx. 3/4" x 28" long.-- It is used for drilling holes in th soil around trees and large shrubs to provice DEEP WATERING. You drill holes around the tree. This allows water to go deep around the tree. You will see the difference! --- $ 10.00 for both - Mike show contact info