Groove spacing is center to center of grooves.
Evergreen EG4030 V-Groove 0.75mm Spacing 1.0mm Thick Plasticard Sheet
EG4050 Evergreen V-Groove Sliding .050" Spacing (1.3mm), UNOPENED UNUSED
EG4060 Evergreen V-Groove Sliding .060" Spacing (1.5mm)
EG4050 Evergreen V-Groove Sliding .050" Spacing (1.3mm)
EG2080 Evergreen V-Groove Sliding .080" Spacing (2.0mm)