Security And Stability:Our High-grade Ladder Jacks are constructed with strength and reliability. The non-slip gripping surfaces are automatically locked in place when you use the stair ladder. The back cross brace structure reinforces the basic support which is up to 500 lbs. (227 kilos). Its ribbed rubber grips on all corners will provide great slip resistance. This Ladder Jacks will give you a comforting experience when you are that high on a ladder painting your stairwell. Special Scientific Triangle Design:Special Scientific Triangle design together with storage space not only keep the ladder leveler more stability stay in place When using Stairs but also provided enough space for you to store tools.This ladder leveler tool even doubles as a stable platform that will hook onto ladder rungs.You can have a stable platform for your ladder in seconds.