Check the listing for details. Heat sink Vevor Kunray Razor motor 1000w 1800 2000 3000watt fits 4 3/16" 108mm. Condition: New. Listed at 49.50 USD. Hello, If you have the clearance! We have the cooling!! We at Outlaw Ebikes are very excited to be offering this new modified Heat Sink! We have added 2 more fins and doubled their size. It fits 4 1/4" 108mm and 107mm Kunray, Vevor, Razor, 1000w 1800w 2000w 3000w Electric Motors. All our parts are inspected, packed, and shipped in the USA. -Heat sink only- DIY boost videos, OUTLAW Ebike build show. https://youtube.com/channel/UCmLnBn6o8srC0d-BaTZGs4g This heat sink fits very firmly over motor, slide the heat sink over ether end of the motor while pulling open. Requires no tools or hardware for installation. Thank you Dennis OUTLAW Ebike build showHello, If you have the clearance! We have the cooling!! We at Outlaw Ebikes are very excited to be offering this new modified Heat Sink! We have added 2 more fins and doubled their size. It fits 4 1/4" 108mm and 107mm Kunray, Vevor, Razor, 1000w 1800w 2000w 3000w Electric Motors. All our parts are inspected, packed, and shipped in the USA. -Heat sink only- DIY boost videos, OUTLAW Ebike build show. https://youtube.com/channel/UCmLnBn6o8srC0d-BaTZGs4g This heat sink fits very firmly over motor, slide the heat sink over ether end of the motor while pulling open. Requires no tools or hardware for installation. Thank you Dennis OUTLAW Ebike build show