The mower deck spindle reinforcement kit is a must-have for Lawn Boy D100, D110, D120, D130, and D140 as well as L100, L110, and LA105. Worn-out or cracked decks can put your lawn mower at risk of tipping over, so this heavy-duty repair kit is perfect for restoring stability. The kit includes three 3/16 inch bolts, ensuring a secure and reliable fix. These units are made of steel, providing long-lasting durability. With this reinforcement, your lawn mower will be as good as new, ready to tackle any yard you throw at it.