Half links for adjusting 3/32” Single-speed narrow type chain lengths
Cranked Links (otherwise known as ½ links) allow smaller length adjustments for Single Speed and hub gear type chains.
Not suitable for use with derailleur gears.
Connex by Wippermann offer 2 main versions of Cranked Links to fit 3/32” chains:
Cranked Link 700 
Colour: Silver
Compatibility: Standard 3/32” Connex chains 700, 7Z1 and 708
Cranked Link 7R8/7E8
Colour: Nickel plated
Compatibility: Heavy Duty 3/32" Connex chains 7R8 and 7E8