Reison Radial Clamp, hook-on type
(25×10 mm European standard)
For rod 16-20 mm.
Available for US siderail
(10-305-US) and UK siderail
(10-305-UK) as well.
Also available is a variant with flat pushing plunge for accessories with one or two flat surfaces on the post. The item is called 10-305-P
Stainless steel, Aluminum, Brass