US PRO 3pc ADJUSTABLE WOBBLE EXTENSION BAR SET 1/4, 3/8, 1/2 B176

1 x 1/4" Drive adjustable from 195 - 320mm
1 x 3/8" Drive adjustable from 240 - 390mm
1 x 1/2" Drive adjustable from 260 - 415mm

Pull collar down to extend the bar to the required length then release collar to lock.