10 stuks HSS 4-fluit rechte schacht eindfrees kit 1.5//2/2.5/3/3.5/4/4.5/5/5.5/6mm Dia 6mm handvat voor hout koolstofstaal gelegeerd staal

Ideal set of HSS end mills foe my Hobby Workshop

Contrary to my best judgement, I bought these because the listing stated they are suitable for aluminium and I needed next day Prime delivery. Somewhat unsurprisingly they are not suitable for aluminium. Within a few minutes into the job, and despite spraying coolant everything overheated and the aluminium stuck between the flutes, the endmill jammed and snapped. I was using the recommended RPM and feed rate for aluminium. A second attempt with shallower (0.5mm) cuts resulted in exactly the same problem (photo attached). I already knew that 4-flute mills are not suited for aluminium work but I was desperate for quick delivery and let my guard down believing what the description said.