The Rock Slide moulded glass slide size S (inside 17 - length 48.5mm)
The Rock Slide moulded glass slide size M (inside 19 - length 60.0mm)
The Rock Slide moulded glass slide size L (inside 20.5 - length 63.0mm)
The Rock Slide moulded glass slide size XL (inside 22 - length 66.0mm)