25mm Square Tube Insert Black | Fits 1–3mm Wall | End Cap

A 25mm square black tube insert with a 1–3mm wall fit is the go‑to solution for anyone needing a secure, professional‑looking finish for metal box‑section, chair legs, fitness equipment, racking, or fabrication projects. Designed for durability and a tight friction‑fit, these inserts stop annoying floor scratches, reduce noise, and provide long‑lasting protection. Customers consistently praise the snug fit, clean finish, and excellent value, making this one of the most reliable tube end caps available.

Engineered from high‑density ribbed polyethylene, this insert grips firmly inside 25mm box‑section steel or aluminium tubing. Whether you're replacing worn end caps, building furniture, or finishing a fabrication job, this insert delivers a clean, flush, professional result. Ideal for commercial, industrial, and DIY applications.

For related items, explore the square tube inserts collection or match with round tube inserts and rectangular inserts.