Boley Size 4 Lathes: Comprehensive Catalogue Types 4H, 4E, 4HR, 4HRA and 4HK Boley Size 4 Lathes - Late models intended for high-precision plain-turning work. A Comprehensive Catalogue showing, in great detail, the Types 4H, 4E, 4HR, 4HRA and 4HK. Manufacturers: Boley Models: 4H 4E 4HR 4HRA 4HK Contents: Catalog