Original General Motors logo key blanks with plastic heads for the B keyways. The "GM" logo is on both sides of the head. Key is for the Door/Trunk/Glove Box (depending on your vehicle). The key blank material is nickel plated brass with black plastic molded around the head.

These are officially licensed OEM key blanks manufactured by Ilco. The Ilco part numbers for these blanks are B49GP. The Strattec (Briggs & Stratton) part numbers are 593197 (Groove 51). 

Cross reference numbers for the equivalent non-plastic head key blanks are as follows:

Strattec: 320589

Ilco: B48G, P1098A, GM-B

Silca: GM3

Cole, Curtis, ESP & Jet: B49

These key blanks work for the original locks for all General Motors makes (Buick, Cadillac, Chevrolet, Oldsmobile, Pontiac) from the model years 1967, 1971, 1975, 1979, 1983, 1984, 1985 & 1986