Material: made of high quality rubber. Durable and could be used for a long time. More stability and safety. 
Size: Hole diameter: 1.1 cm/0.43 in. This hole size is suitable for most brands of trekking poles. These tip protectors could prevent premature wearing of metal tips. Easy to install and remove and they are environmental because they minimize terrain scarring and prevent damage to nature. 
Wide Applications: these trekking poles are perfect suitable for hard surfaces like paved trails, roads, sidewalks, or rocky terrain. Most importantly, additional traction form tips will improve stability

8mm 10mm 14mm 16mm Plastic Floor Protectors Pipe Clamp Tube Clip Feet on Sled Chair Glides for Tube type Furniture
Replacement Clip on Glides for Sled Type Chairs and Tube Type Furniture and are available in multiple sizing options. The Clip on Glides for Sled Type Chairs and furniture are manufactured from "polypropylene" that is extremely durable and suitable for all flooring surfaces.
These feet are very common on all Sled Based Chairs and Tube Type Stools and Furniture.

8mm 10mm 14mm 16mm Plastic Floor Protectors Pipe Clamp Tube Clip Feet on Sled Chair Glides for Tube type Furniture
Replacement Clip on Glides for Sled Type Chairs and Tube Type Furniture and are available in multiple sizing options. The Clip on Glides for Sled Type Chairs and furniture are manufactured from "polypropylene" that is extremely durable and suitable for all flooring surfaces.
These feet are very common on all Sled Based Chairs and Tube Type Stools and Furniture.

PP PE Square Chair Furniture Leg Tubing End Caps Feet Tube Insert Plugs Stopper Chock These high-grade Plastics black ribbed plugs work great for preventing scuffs on wood floor or as protection glides on chair tips, bench feet, table legs, bar stool foot sliders, chair leg protectors, patio furniture inserts, and much more. They are also designed to hold up against impact abuse, and harsh weather conditions. * Easy to install 1 1/2"x1 1/2" snap-in plugs serve as a long-lasting solution for many household or outdoor projects including replacements for fence/fencing railing posts, gate rail post covers, trailer frame ends, pole pipe rod caps, metal bike rack fittings, wrought iron steel finishing plugs, or any sqaure opening.

Furniture PVC Rubber Plastic Pipe end cap Plug Thread Tube insert Various tube protectors: Thread tube insert, adjustable leveling feet, rubber feet, chair glides Protect your hard surfaces,Reduce scratching and noise. Easy installation,perfect for all furniture. These leg tips protect vinyl, ceramic, hardwood, and laminate flooring. Available in a variety of sizes to fulfill all floor protection needs.