This bracket is designed to mount on to 1.67" diameter vertical posts.
(Qty 2) QS-113 screws sold separately - used to connect saddle to handrail.
(Qty 1) QS-113 screw sold separately - used to connect bracket to 1.67" diameter vertical post.
Mount the back plate on 1.67" diameter posts (tube item# A114).
Small set screw size: 2.5 mm hex.
Saddle screw size: 4mm hex.
Use A110, A111 or A114 as handrail (1.5 or 1.67" diameter tube).