Clamp is designed to be fastened (via 4 screws not included) to hard surface Pulling clamp handle down exerts clamp pressure vertically downward Clamp spindle has thick neoprene tip to protect surface of clamped item (replacement tips available, sold separately) Overall length description below is with handle in down (clamped) position Overall Length: 5-7/16" Clamping Force: 200 lb