Designed for use with the Stoelting Micromotor Drills
The Stoelting Drill Holders were designed specifically for the Stoelting Micromotor Drills (51449 and 51555).
The 51630 Stoelting Drill Holder is for the Stoelting Micromotor Drill (51449). Inner diameter: 28mm.
The 51630-1 Stoelting Drill Holder is for the Stoelting Portable Micromotor Drill (51555): Inner diameter: 23mm