Rangem.s. Industries offer a wide range of variable effort supports right from 2.5 kgs to 24835 kgs spread across several travel, load & support configuration types. Working ranges vs1 - 35 mm vs2 - 70 mm vs3 - 140 mmwith 29 spring sizes (size 1 to size 29) within each travel range. Support types a, b, c - top supportedd, e - top mountedf - base mounted