Structural T-A Spade Drill Holders 3-Series - Standard #4

A long-lasting, high-tech alternative to standard HSS twist drills, the individual standard T-A (throw away) non structural holders can accept virtually any insert size within their corresponding series number, denoted by the codes ‘Y to ‘8’. Structural ranges, due to the greater stress resistance needed. Work differently and require the insert drilling diameter to be matched to that of the holder to a much higher degree.