The tool holder is 60mm (2.362") wide, which is 10mm (0.393") wider than the Aa, which gives it better clamping capacity.
There is a comparison chart below where you can see the difference between them.
INTRODUCE
Quick Change Tool Post Set has 4 holders for lathes with a center height of no more than 125 mm(4.92″).
Recommended top slide width ：55-70mm
Adjustable turning tool height ：15mm
Lathe swing ：150-250mm
Ec Model : S/N：01013 ,Hole diameter : 18mm
Ed Model : S/N：01014 ,Hole diameter : 18mm
(Ec is made of steel,Ed is made of stainless steel).
FEATURES
1.Tool post&holder with precision profile-ground gearing.
2.Plenty of working positions foe more tool holders.
3.Adjust height of cutting edge easily and accruately .
4.Change tools in seconds.
5.Accurate repeatabilityis 0.01mm.
Q What is the difference between 45# steel and stainless steel?
A Most of the market are 45# steel, it can also meet your basic use requirements, but over time, the screw that fixes the tool may have the problem of deformation, because the hardness is not enough, so we manufactured the stainless steel material, it is harder than the 45# steel material, the service life is longer.
Q How do I choose them?
A If you use it less often, you can choose 45# steel, if you use it more often it is recommended to choose stainless steel, it can accompany you for a longer time.
