The LiquiSlide - Pinky XS Sized Glass Guitar Slide - Light Green

Max USA Ring Size: 7.25
UK Size: O/P
European Ring Size: 55/56 mm
MM Diameter Across Hole: 17.5 mm
Inside Circumference of Ring: 55 mm
Length: 2.69" or 68.33 mm
Outer Wall to Outer Wall Diameter: 1.08" or 27 mm 
Circumference: 3.39" or 86.1 mm

Since LiquiSlide is handmade, the dimensions can vary by about 5%