These anti-tippers fit standard frames for new style Invacare, Medline, and others with a kick tube height of 6" to 10 1/2" from bottom of kick tube to floor. Fit on the outside of tubing. Specifications Fits over 1" OD Tubing Push-Button Style Adjustable Height Sold in Pairs. Wheelchair Accessories, Anti-Tippers, Assembly Required, Adjustable-Height Push-Button Rear Anti-Tippers - 1" Tubing - Wheeled.