- Type1 Pilot Drill : Suitable for Hot Tapping Series 1 and 25mm Hole Saw - Type2 Pilot Drill : Suitable for Hot Tapping Series 1 and 50-75mm Hole Saw - Type3 Pilot Drill : Suitable for Hot Tapping Series 1 and 100mm Hole Saw - Type4 Pilot Drill : Suitable for Hot Tapping Series 2 and 100-150mm Hole Saw - Type5 Pilot Drill : Suitable for Hot Tapping Series 2 and 200mm Hole Saw - Type6 Pilot Drill : Suitable for Hot Tapping Series 2 and 200-250mm Hole Saw - Type7 Pilot Drill : Suitable for Hot Tapping Series 2EX and 300-400mm Hole Saw