RELIABLE HEAVY DUTY CONSTRUCTION - Entire support bracket and internal parts are made of high grade steel, providing years effortless rolling and durability. The heavy duty design supports up to 650 lbs as a set of 5. RELIABLE CONSTRUCTION - frame, stem and wheel axle all made of high-grade steel. The casters are made of durable hard plastic with a shell of top-quality transparent polyurethane. EASY INSTALLATION - Just pull off the old casters from the chair base, with no need for any tools - and push the stem of your new office chair wheels into the socket, until the stem is firmly anchored. Specifications: Material: Polyurethane layer & Nylon body | Feature: Twin Wheel Size: Wheel Diameter: 3 inch (75mm) | Stem Diameter: 7/16 inch (11mm) | Stem Height: 7/8 inch (22mm

Features:

RELIABLE HEAVY DUTY CONSTRUCTION -  Entire support bracket and internal parts are made of high grade steel, providing years effortless rolling and durability. The heavy duty design supports up to 650 lbs as a set of 5.
RELIABLE CONSTRUCTION - frame, stem and wheel axle all made of high-grade steel. The casters are made of durable hard plastic with a shell of top-quality transparent polyurethane.
EASY INSTALLATION - Just pull off the old casters from the chair base, with no need for any tools - and push the stem of your new office chair wheels into the socket, until the stem is firmly anchored.

Specifications:
Type: Office Chair Caster (No marking, No noise)
Material: Polyurethane layer & Nylon body
Wheel Diameter: 3 inch (75mm)
Installing height: 4-1/4inch (108mm)
Stem Diameter: 7/16 inch (11mm)
Stem Height: 7/8 inch (22mm)
Feature: Twin Wheel
Quantity: 5-Pack 

Package included
5 x Office Chair Casters