Requires no tools, drilling or bolting to hold it securely in place. Aluminum design keeps handles from getting hot in the sun. Simple to use knob, tightens by hand without scratching or damaging ladder. Cushioned bumper pads help to protect the eaves of the roof. Added hand grips for easier usage. Safety latch prevents unit from slipping off ladder. Complies with OSHA standard 1926.502 (b)(3), 1926.1053 (b)(1) and ANSI standard 14.2 section 8.3.3.