M8× 1.25 or 9/32 40 or 5/16 24 re-threaded
Great price and product. Well made. Better than expected . Better than a dremel for the price. Got two for 1 Dremel price. Has 3 speed settings and all in between speeds available on dial SO IT'S VARIABLE!!! FLEXSHAFT IS A MUST FOR LAPIDARY but must use a key on shaft to lock it unlike drill switch that is convenient. RT5100 RTX is for this tool keeps the warranty and works great with a fixed (marker like) handpiece. Fits 3mm accessories out the box. Order a 3/32" collet for 2.35mm accessories and anything else use dremel 4486 chuck for 0.3-3.4mm or gyros micro chuck for micro bits (drill, polishing pins). Get a good collet set the cheap 10 piece brass sets collets break (1+ dollar). Get the Dewalt rtx collets or the OEM rtx ones; they are completely solid and worth the extra few dollars. You need accessories so shop around i have 300+ mandrels for 35-50 dollars with diamond coating for rocks mostly 3mm some 2.35mm (you'll need both 1/8" & 3/32" collets or 4486). Be very careful to get right chuck sizes and mandrels and "HERE WE GO". 1-12,000rpm,2-24,000rpm,3-30,000rpm are settings-3 speed. If you want the better (industrial) version get the RTX2A which comes in a hard case and much more. It has more torque in the motor and is 2× as powerful. It also has 6 speeds starting at 8,000 rpm not 12,000 (More like a FOREDOM or dremel).
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