H-V 1/4" - 9/32" (6.35 - 7.14mm) - Square Shank 2.70mm
H-W 9/32" - 5/16" (7.14 - 7.94mm) - Square Shank 3.40mm
H-Z 5/16" - 11/32" (7.94 - 8.73mm) - Square Shank 3.55mm
H-Y 11/32" - 3/8" (8.73 - 9.52mm) - Square Shank 3.70mm
H-1 3/8 - 13/32 (9.52~10.32mm) - Square Shank 4.40mm
H-2 13/32 - 7/16" (10.32-11.11mm) - Square Shank 4.95mm
H-3 7/16 -15/32" (11.11-11.91mm) - Square Shank 5.55mm
H-4 15/32 - 17/32" (11.9- 13.5mm) - Square Shank 5.55mm
H-5
17/32 - 19/32" (13.5 - 15mm)
- Square Shank 6.40mm
H-6 19/32 - 21/32" (15 - 16.6mm) - Square Shank 7mm
H-7 21/32 - 23/32" (16.6 - 18.2mm) - Square Shank 8mm
H-8 23/32 - 25/32" (18.2 - 19.8mm) - Square Shank 8.90mm
H-9 25/32 - 27/32 (19.8 - 21.4mm) - Square Shank 10mm
H-10 27/32" - 15/16" ( 21.4 - 23.8mm) - Square Shank 10.75mm
H-11 15/16" - 1.1/16 " ( 23.8 - 27 mm) - Square Shank 11.90mm