ADJUSTABLE BED SHEET FASTENERS: Bed sheet holders made of elastic nylon band in 1 inch or 2.5cm wide. Each bed sheet fastener is adjustable from 8.5 to 13 inches (22-33cm), with full extension up to approximately 13 inches (33cm). Adjustable mattress corner clips with strong elasticity, adjustable length allows desired tension to fit your every need for the night..PREMIUM BED SHEET FASTENERS: Heavy duty bungee cord lock, nickel plated clamps with plastic grips inside, our bed sheet fasteners hold your bed sheet tight without damage..STABLE HOLD: Bed sheet holders wide elastic nylon band and heavy duty clips, stable and able to hold sheets in place. To fasten, simply clip the holders to sides of the sheet or corners. Adjust the bands to your desired tension..SLEEP IN COMFORT: These bed sheet fasteners hold your sheets and keep corners in place all night long, keep your bed always looks neat. No more sheets coming off and or bunching up all over the bed. These mattress corners clips will end the battle between you and your sheets, giving you better sleeping experience and an easier morning without untuck sheets..WIDELY USE: Our bed sheet fasteners fit with fitted sheet and flat sheet for sizes Twin, Twin XL, Full, Full XL, Queen, King & even up to California King sheets. Use these adjustable mattress corner clips on sofa cover, couch seat cover, car seat cover, chair cover, tablecloths, ironing board covers, slipcovers and so one to make your life easier.