How to calculate cutting length of  (4 - LEGGED STIRRUP)

Normal stirrup calculations is very easy but if we talk about 4-legged or 6-legged stirrup it is difficult to calculate.

WHAT IS STIRRUP

Stirrup are mainly used for shear resistance.
Mainly put in beams, columns etc..

WHAT IS 4-LEGGED STIRRUP

it is used for shear resistance but they have 2 no. Ring having 4 legs.