👍SIZE: the 18mm is the diameter of plastic part, the diameter of the felt is 15mm. Please read the size picture carefully before buy. 👍HIGH QUALITY: Our floor protectors are made of stainless steel nail, nontoxic ABS plastic case and soft but thick felt. Strong and long lasting.👍MULTIFUNCTION: Soft touch felt pads protects hardwood, ceramic tile, linoleum and floors surfaces, prevent from marring and scratches; Slip smoothly, reduces friction vibration & noise while moving furniture. Lengthen the life of the floor. 👍WIDE USE: It is suitable for wooden tables, cedar chests, chairs, curio cabinets, desks, and a variety of other wooden furniture items, It can raise the furniture slightly and protects it from moisture. 👍NO MORE SLIDING OFF: Sometimes adhesive pads or feet cover caps slide off easily, use our floor protectors and say byebye to this trouble. Our floor protectors lasts also far longer than stick-on pads or feet cover caps. And it's easy to replace. 👍INSTALLATION TIP: You'd better pre-drill pilot hole for hardwood to prevent nails from bending,plastic cases from breaking,or furniture feet from cracking damage. Furniture Protection Felt Pad for Chair Table Leg (40 pack) Are you still worried about your beutiful floor? Are you mad with the noise of moving furniture? Use these furniture protect nails: They are protective, protects your furniture and floor, that will extend the service life of the furniture and the floor. They can reduce noise, then you can enjoy the peace and quiet.