The Leofoto DC-24 Anti-Twist Mini Clamp provides Arca support and a bubble level on top, and has 1/4"-20 and 3/8"-16 threading with anti-twist grooves on the bottom. It measures 1 x 3" (with the bubble level and screw knob clamp included in the 3"). It also features a 1/4"-20 accessory thread on the side.