NOPPOR Tile Wood Vinyl Floor Anti Slip Rug Grippers Holder Runners Grip Underlay Pads Non Slip Stickers Set of 4 Ideal for tile, wood, vinyl surfaces(smooth and clean surface only,may not suitable for rug on carpet). Each is 6-1/4" L x 4-1/2" D. Set of 4. Triangular plastic grips hold area rugs and runners in place with sturdy raised teeth; adhere to flooring with self-stick backing. Prevent rugs from curling, sliding and bunching; improves home safety. Keep rug corners flat to prevent slips & trips teeth length:6mm(0.24'') Peel off one side of the double sided adhesive, stick it to the clean smooth floor;peel off another side,stick it to the back of the plastic pad,keep pressing the pad to floor for 30 seconds-get secure holding ,repeat for another 3 corner ,put the rug on ..Teeth length:6mm(0.24'').