Brass ferrule, Available in 10 mm and 11 mm.
10mm Tube OD Brass Compression Sleeves Ferrules Brass Ferrule Insert Fitting Kit
92066 Brass Ferrule for Hose Barb Fittings; 0.687 I.D.
Brass Ferrule – Toolnut
Brass Ferrules for Air & Fluid
Ø 10 mm Brass Ferrule with steel screw - JMC Billard
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Robert Sorby Brass Ferrule - Turners Retreat
10x Fitting Brass Ferrule 1/8 1/4 3/8 1/2 3/4 Inch Inner Outer
Ferrule Brass .085