This useful Chalk Holder is great for any teacher. The holder will keep hands clean,
reduce mess and prevent the chalk from breaking. It easily extends and retracts using a precision collet mechanism holding even the most tiny piece of chalk firmly in place. Fits standard board chalks up to 3/8 inch and features a handy pocket clip.
Uses PKCKBU bushings and 12.5mm drillbit (formerly known as DB.492).