Delta GR150 6″ Bench Grinder. Delta 23-640 6″ Bench Grinder. Delta 23-880 Type 2 8″ Bench Grinder. Delta 23-640 Type 1 6″ Bench Grinder. Delta 23-680 Type 2 6″ Bench Grinder. Delta GR100 Type 1 6″ Bench Grinder.