10
12
15
no limit
2
3
5
300 to 350 mm
400 to 450 mm
500 to 550 mm
600 to 650 mm
equal to width of stairs
half the width of stairs
twice the width of stairs
one fourth the width of stairs
90° and 0°
75° and 30°
60° and 10°
40° and 25°