Question:Is there a case for these drill bits ? Answer:They are in individual cases Question:Can these hole saws make holes on metal? Answer:No,these can not work with metal. They work great on wood and wood product ! ?19 Sizes Included?: 10mm(2/5inch),12mm(8/17inch),15mm(19/32inch), 16mm(5/8inch), 17mm(43/64inch), 18mm(45/64inch),19mm(3/4inch), 20mm(25/32inch), 21mm(53/64inch),22mm(55/64inch), 23mm(29/32inch), 24mm(15/16inch), 25mm(1inch), 26mm(1-1/16inch), 28mm(1-1/8inch), 30mm(1-3/16inch), 32mm(1-1/4inch), 35mm(1-3/8inch), 40mm(1-4/7inch)