Finger Sizers-Plastic Ring Sizing Tool These inexpensive plastic Finger Sizers work just like a belt. Simply push the end through to form a ring shape, then slip onto finger. Adjust to a comfortable fit that slips over knuckles without difficulty, then read the indicated size. Each finger sizer features measurements 1 to 17 in 1/4 size increments. Overall length: 5" (Size measurements: 1-17) Package of 1