SMC MGP Z Series. Compact Guide Cylinder, With Air cushion, MGPM20 250AZ M9BWL Hex Bit Socket Set C75 series: CD75、CD75W、CD75K、CD7 C75 series: CD75、CD75W、CD75K、CD7 Specification item model symbol Specification information built in magnet D built in magnet installation support B Basic type tube inner diameter 25 tube inner diameter 25mm cylinder stroke 75 Cylinder stroke 75mm dual stroke mark No dual stroke mark cylinder stroke 2 Cylinder stroke 2 None option C With rubber bumper (for long stroke: standard) auto switch Without auto switch Auto switch additional symbol 2 with or without Custom made specifications standard