The push element is a worm. In order to mix the wheel/worm into a worm gear, it have to be ensured that the centre distance is equal and the transmission ratio is equivalent. Heart distances are obtainable from inventory in little steps in between 17mm and 80mm. Each and every centre length has a number of gear ratios. Ep worm gears are suitable for the manufacturing of worm drives with a shaft angle of 90°. Utilizing a worm generate, quite large reduction ratios (up to 100:1) can be reached.