That looks like it is for ‘DC**07020*’ inserts – so for example, something like DCMT070204, or DCGT070202 – broadly, the letters define the shape and style and the numbers represent dimensions.

Commonly the choices are between M for ‘Moulded’ or G for ‘Ground’, and the final variable requiring you to make a choice is the last number which represents the tip radius in tenths of a mm – usually available in 0.2, 0.4, or 0.8mm

For most applications (and especially non-ferrous work) the ground DCGT inserts are usually best choice for a hobby machine, and a 0.2mm radius would probably also be better – so those inserts would be ‘DCGT070202’.

DO the other holders in the set use the exact same tips?! – if not you’ll have to post them individually – some sets are ‘mixed’

– also have to say that particular tool shape would not be the one I picked out first – is there one called ‘SDJCR’ in your set?

MGEHR ****2 – use grooving / parting inserts MGMN200 (‘straight’ across the front) or MRMN200 (with radius). The 200 indicates they are 2mm wide.

The turning tool and boring bar marked SCLCR use CC*T 06020*, same conditions apply as with your DC*T inserts so use CCGT060202 (or CCGT060204 if you want a bigger tip radius).

SNR0010K11 is an internal threading tool for 11NR partial form threading inserts –

The unmarked tool should be something like SER1010H16, an external threading tool for 16ER partial form threading inserts –

– with these 11 & 16 denote size, N & E denote whether interNal or External, and R is for Right-cutting (i.e. tool moves towards the chuck).

Don’t know whether you know about thread angles, but very simplistically ‘55′ inserts are for Whitworth and other threads with 55 degree flanks, and the ‘60′ are standard for ISO metric and UN-series threads – you may come across other or uncertain thread-forms and you can always ask again then..

If you want to understand the code on the holders then this page from Cutwel is quite easy to follow