12" PLUS-LOK™ SDS Plus ExtensionBellhanger Bits 5. 0 out of 5 stars, average rating value. Read a Review. Same page link. 5. 0 (1) Install small wire systems easily and efficiently with the Milwaukee Bellhanger Bits. Designed for installing all types of small wire systems including computer, security, phone, and cable, Milwaukee Bellhanger Bits provide extra reach where needed and a hole in the tip to help pull wires through holes. The bits feature aggressive tip geometry for faster