Replacement Wiper Arm Knurl
1/2" O.D x 1/4" I.D With 10/32 Grub Screw

Our splined wiper knurls are for wiper arms that use a 1/2 inch knurl. They are available with a 1/4 inch ID or with a 10/32 thread. Our stainless steel and our aluminium wiper arms use the 1/2 inch knurl.