Core bit sets

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burner

Hi can someone give me advice on core bits and correct sizes, i have noticed that most sets come with 38mm,52mm,117mm & 127mm, am i right in thinking the 38 is for 32 waste pipe, 52 for 32 & 40 waste fittings, 117 for 110 soil pipe but is the 127 big enough for the collar on 110 fittings like branches etc as these are partially in the wall on the outside of a house. Also has anyone used jcb edge core bits as i can get a set for £115 where they are £180 in screwfix, im under the impression that marcrist are the best but cannot really afford them, i would be gratefull for any advice from someone that has been there and done all this before thankyou.
 
I wouldnt buy the rotenburger set again, my last set lasted less than 12 months.

teeth have fallen out and extension bars are all bent
 
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