The product is 61640 COLLET
Quick-connect CR-400 female coupler for connection to a CH-604 male coupler (sold separately)
Elements: lead-free replaceable cartridge insert - default temperature: 120 degrees F - mounting: vertical
#3 x 4 in)
Extra large bi-material handles provide exceptional grip and comfort and allow the use of both hands for maximum leverage
Jet 565161-6" Bi-Metal Vari-Pitch Holesaw Power Tools The product is 61640 COLLETIndustrial quality holesaws with special bi metal construction , Fast cutting 4 6 variable tooth provides faster cut than standard configuration , Hardened high speed steel teeth are laser welded to a tough shatterproof high carbon steel body , to produce a highly durable , long lasting holesaw , Ideal for cutting mild steel , stainless steel , aluminum , cast iron , copper , brass , wood , plastics and composition board