Kolb Opco 175 Jig Borer. Manual Kolb Opco 175 Jig Borer (Optical Jig Borer) Operator's Instruction Manual and Sectional Parts Drawings and a copy of the maker's Sales & Technical Specification Catalogue. Manufacturers: Kolb Models: 175 Opco Opco 175 Contents: Operators Manual Parts Manual Catalog