This kind of products is the best for agricultural machine tools. Not only hard,but also wearable.

2.0X12X40;2.0X6.0X35; 3.0X13X40;3.2X13X13;3.2X13X254.0X13X32;6.0X17X30;6.5X19X19;AS6.4X6.4X6.4;3.2X19X25A1000;A1000-50R...Any shape as your required.