These protectors are used to slide over the shaft to protect the shaft from the chuck jaws when clamping onto it for repair. These are machined concentric to enable you to perform GREAT tip and ferrules on shafts.

X-Small =10mm - 11mm
Small = 11mm - 11.75mm
Medium =11.75mm - 12.5mm
Large - 12.5mm - 14mm 

Made in USA