Side Arms can be clamped anywhere on the stand riser allowing a light to be lowered to just above the legs and slightly offset without the need for another stand. The Heavy Duty Side Arms utilize a special vice clamp and are made with heavier materials. In both cases the Baby terminates in double 5/8" pins and the Junior in a single 1-1/8" Posi-V-Lock receiver . CAUTION: When using a Side Arm place a sandbag on the far leg with the same amount of weight of the light fixture. This will help prevent tipping of the stand.