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This is a brushed stainless steel lockable collar with a removable O-Ring at the front. When the O-Ring removed, this collar looks like a simple choker. 

This collar secures with a small hex screw that is integrated into the locking tab on the side opposite of the hinge. The collar locks when the hex screw is screwed into a small grove on the lower portion of the locking tab, thereby preventing the collar from opening. 

The collar can be opened by giving the screw 1-2 turns with the included hex key. Please do not fully remove the hex screw, as re-inserting it can be a pain & it can easily be lost if dropped,also we would included an other spare screws in package.

Please be extremely careful when closing the collar. The hinge has the potential to pinch as you are closing the collar. 

Internal diameter CHANGE to circumference are:

100mm (circumference 31.4cm,12.36'' inches)

110mm (circumference 36.5cm,13.6'' inches)

120mm (circumference 37.6cm,14.8'' inches)

130mm (circumference 40.8cm,16'' inches)

135mm (circumference 42.3cm,16.6''inches)

140mm (circumference 43.9cm,17.3'' inches)

150mm (circumference 47cm,18.5'' inches).