Connecting shaft diameter is 26mm, M8 thread. The hole distance between the pump and the base is 115mm, 4 holes, M8 thread. (The base is not included) Specification: Name: Barber Chair Hydraulic Pump Color: Silver Height: 38cm / 15.0inch Height after stretching: 49cm / 19.3inch Adjustable height: 11cm / 4.3inch Feature: - Barber/ Salon chair hydraulic pump - Replacement part for most standard styling chairs - 440 lbs weight capacity - This is a 4 bolt pattern pump - Easy to use, clean, and swap out Package List: 1x Barber Chair Hydraulic Pump (The base is NOT included). 11cm ...