GENERAL TECHNICAL INFORMATION THREADING TOOL HOLDERS DESIGNATION SYSTEM 1 CLAMPING SYSTEM 3 HAND OF TOOL S – Screw clamping R – Right hand L – Left hand SER 2 APPLICATION E – External SEL I – Internal 4 SHANK SIZE External tool holders Shank : h x b 0750: .75" x .75" Internal tool holders Shank: Diameter d 0750: Diameter .75" 1242