PRODUCT DESCRIPTIONIt is an excellent-quality handpiece designed for general daily use. Has prelubricated sealed ball bearings that do NOT require any additional lubrication. Adjustable key-type 3-jaw #0 chuck fits shanks from 0" to 5/32" (0-4mm). PRODUCT SPECIFICATIONS .- Size 1" dia. x 5-1/4" long. .- Fits shanks from 0" to 5/32" .- Chuck key included .- Prelubricated ball bearings