You are looking at a steel fabricated impeller Suitable for 71 frame motors 11mm shaft (0.180 KW typically). grub screw for locking in place Will move 800m3/hr appx when driven at 50Hz speed in a proper fan case 140mm dia 80mm deep Hub is 10mm proud on the back of the impeller meaning plenty of clearance for the impeller when pushed to the end seal of the motor. Heavy duty hub, balanced with weights to balance standard G6.3 Thick sheet steel impeller blades Will cope with dust and small particles going through it - so long it doesn't clog the blades This will be suitable as a spare for our U/HC162 fans we are selling under this listing: https://www.ebay.co.uk/itm/302466421867 Price includes VAT 01446 743012 if you need further information.