Set of 3 1/2" sockets for aluminum rims - 17,19,21mm. Product code: GA00016. Manufacturer: GROSLEY. Manufacturer code: 59030031521449 - GROSLEY aluminum rim sockets (17 mm, 19 mm, 21 mm).. - Set designed for loosening screws of different diameters in the sockets of aluminum rims.. - Made of chrome-molybdenum steel.. - Teflon safety collars to protect the rim from damage to the paint finish. - Teflon safety collars to protect the rim from damage to the paint finish. - 3 colors, making it easy to distinguish sizes.- The sockets have a safety feature that makes it easy to release the unscrewed socket and bolt.. - The set is packaged in a case made of shatterproof plastic.