Beltec have over 20 years experience in designing and manufacturing auger bits. All dirt auger bits are to suit a 2? Hex output shaft which is the universal standard for the US and are the most cost effective solution for drilling with skid steers and mini excavators. All augers feature a hardened cast boring head. All augers have heavy duty round tubing.Steel dirt teeth and pilots are standard teeth for softer grounds like soil and dirt. All Attachment Company augers are warranted for the periods summarized below. All Other Parts / Products - 24 Months.