Hydraulic Hole Expander Suitable for expanding the hole on distribution boards, instrument panel, switch box oe other plates. Hydraulic Hole ExpanderSuitable for expanding the hole on distribution boards, instrument panel, switch box oe other plates. ModelDrilling Force(KN)Drilling Thickness(mm)Mould(mm)Weight(kg) SYK-3103Φ16.2 Φ22 Φ27.5 Φ34 Φ39 Φ43 Φ49 Φ60.510.0 Hydraulic Hole Expander