Our M3-0.25 high-vacuum compatible fine adjusters are available in standard lengths from 8 mm to 25 mm and are supplied with a 53 HRC 1.6 mm dia. tip and provide sub-micron sensitivity. The screws are made of passivated 304 SS and include a relief in the ball cavity which allows air to escape from under the ball-tip. Our metric ultra fine adjusters are HEX driven (1.5 mm) and optional knobs and drive types are available. Thread class exceeds 6g. Additional lengths available by request. Note: Kozak Micro cannot guarantee that our screws and bushings will be compatible with screws and bushings sold by other manufacturers.