Quick-Step Haas Velox Ascent System — Russo Power Equipment
HAAS Velox Floating Knee Ascender || WesSpur Tree Equipment
Eccentric Cam Knee Ascenders: HAAS Tree Gear
Knee ascender" brought over from the arborist market. Is used with a foot ascender for really long ascents. Called the HAAS (Haul Ass Ascent System) : r/climbing