Check the listing for details. #4 kit Mitutoyo Caliper Replacement Part: Roller 141771. Condition: New. Listed at 10.00 USD. Important! Please scroll to the bottom of this window to see the models this cover will fit.#4 kit Mitutoyo Caliper Replacement Part: Roller 141771 Hello and Welcome! Up for sale are OEM replacement Mitutoyo Rollers for your digital caliper! These Rollers get lost after the hook gets broken and then you can't adjust your caliper precisely! This sale is for ONE Roller! Mitutoyo part number 141771 This Roller works with the #3 Hook Roller Kit which is not included in this auction. Please see my other auction for those. Please add both parts to your kart so we can combine shipping to keep your cost low. This part number fits these models according to manufacturer owners manuals. Notes 500-150-20 500-151-20 500-152-20 500-154-20 500-155-20 500-156-20 500-157-20 500-158-20 500-159-20 500-160-20 500-163-20 500-164-20 500-170-20 500-171-20 500-172-20 500-174-20 500-175-20 500-176-20 500-177-20 500-178-20 500-184-21 500-195-20 500-196-20 500-197-20 Important:There are a many different Mitutoyo calipers so please make sure you know what part number your caliper requires!Please email me if you need assistance determining what Hook Roller fits your caliper!! Please take a good look at my pictures. I have included a close up of my caliper. If you buy a part and it does not fit, just send it back to me and I'll refund your purchase. If for some reason the part listed above does not fit your caliper, please be understanding and leave good feedback for me (after I refund your purchase of course). I took the time to study the manufacture parts lists and compiled my list above. I'm not perfect, there may be some errors. Thanks for looking! Mark and Sandra