The G4 is a 2-pin cap with 4mm pin spread (centre to centre), with each pin being 0.7mm in diameter. The cap has a flattened glass base, with no cut grip channel.
The G4 cap is used on some MR11 reflectors and many halogen capsules or LED retrofit equivalents.
MR11 Reflector, Halogen Capsules (including many ‘M’ Class Display Lamps), LED Capsules.
From: £1.34 ex.VAT