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This range are great for when you need to connect and un-connect on a frequent basis due to the automatic double trigger locking device.
The M40 & M42 are made from aluminium with the M40 having an opening of 25mm and the M42 with an opening of 21mm.
The M41, M46 & M47 are made from steel with the M42's opening being 18mm, the M46 & M47's opening is 20mm.
The M46 has a fall indicator, the M47 does not.
