... with us Worm Gear Screw Jacks Type NP/I, Version B: With anti-rotation guideHousing: Size 0, 1 ... made from aluminium alloy (Size 1 in die-cast version), Size 3 and 4 made from grey or ... available as left-hand, stainless steel or ball screw version. Protective sleeve: The versions A and B are, ... order, supplied with a protective sleeve.Version B: Is the same as version A, but inside the gear unit ...