Drafting Stool Counter Height Chair Kit 19" Footring rest 10" Stroke Cylinder 2 Piece kit. 1 X 10" stroke cylinder and 1 X 19” diameter footring. In a typical installation, your seat will reach 32" from floor to top of seat. (+/-). WARNING: This kit should NOT be used on executive or any tilting rocking chair. You should ONLY use on basic task chairs with minimum of 25" diameter base.