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Hi there, no this isn't the correct drum. The drums for the HL-L3270cdw can be found at the bottom of this page:
https://www.cartridgemonkey.com/model/Brother-HL-L3270cdw-toner-cartridges/
Hi there, this is a 4 pack of drum units. Drum units are a maintenance item that the toners connect to in the printer. They don't contain any toner but have a metal cylinder that moves the toner on to the page. The DR248CL reference is the reference for the drums, but the toners have different references to this.
For replacement toners the references are TN248BKfor black, TN248C for cyan, TN248M for magenta and TN248Y for yellow (the TN at the start represents 'toner' where the DR represents 'drum'). You can also buy a XL version of these cartridges as well if you need to print more. There are also multipacks of 4 toners available. You can find all the replacement toners and drum on the following page:
https://www.cartridgemonkey.com/model/Brother-DCP-L3520CDW-toner-cartridges/
If you need any more help, please let me know.