This sheath (or scabbard) is fit for a Belt Friction Sheaths for Doug Ritter RSK® Mk1 Folding Utility Survival Knife. But it's fairly universal and will fit other knives in a similar size.
The full-sized RSK® Mk1 is 4.62 in. (11.74 cm) closed with an open length of 8.06 in. (20.48 cm).
Doug Ritter RSK® Mk1 Folding Utility/Survival Knife www.dougritter.com/dr_rsk_mk1.htm
The Sheaths will hold your knife in place using just pressure.
Leather Used: Oak-leaf Veg-Tan Sides. This premium imported veg-tanned leather is tanned using a tannage that produces leather with excellent tooling and embossing properties. 
✤ Premium full-grain 8/9 oz 'natural' veg-tanned tooling leather
✤ 1 3/4" x 3/8" belt slots
✤ Hand-stitched with military parachute-grade thread
✤ Hand-burnished leather Edge
✤ Hand-painted with Fiebing Oil Dye
✤ Great design for travel or for everyday use
✤ Very strong construction, this will stay with you for a lifetime
✤ Looks nice and so easy to carry by Men & Women (Unisex)
✤ This is a great gift and it can put a smile on faces
✤ You will love it because it's compact and not bulky
✤ Occasion / Usage: Gift, Pancake knife sheath, Knife Sheath
✤ Handmade in Canada, Quebec https://www.adonisleather.com/