Thin Wall Centering Pin Center pin for use with 1-3/4" and larger thin wall core bits. Features: For Starting Holes Only Use with Thin Bits 1-3/4" Since its founding in 1924, Milwaukee has focused on a single vision: To produce the best heavy-duty electric power tools and accessories available to the professional user. Today, the Milwaukee name stands for the highest quality, durable and reliable professional tools money can buy.