Rolled Super Soft Collar & Lead made with Italian LEATHER: 14" Collar - fits neck sizes from 11" to 13"; Lead 44" 6mm (thick) : Amazon.co.uk: Pet Supplies
6mm Rolled leather show half check collar
ENCL30-6MM-SS, 6mm Thin Line Shaft Collar, Stainless Steel | Ruland
uxcell Drill Stop Collar Set 3mm 4mm 5mm 6mm 8mm 10mm 12mm I.D. with Hex Wrench Carbon Steel for Set Screws Chuck Woodworking Drill Bits Depth Holder Black 7pcs : Amazon.co.uk: DIY