Length, 25 mm Thread diameter, 7 mm Unit per package, 250 Lock nuts or nuts included, Yes Backers included, No Model, ST25R Number, 103125For 1.6inch Cobra Track with already pre drilled holes Caracteristics Oversized and pointed tungsten carbide For enhanced traction Hot dipped steel and galvanized stud Big tread for good anchoring Lasting durability Light Easy to install and dismantle 100, 150, 200, 250 and 1000 unit packages Installation Tool Included ST = Standard Tread (without shoulder) R = Racing (the carbide is pointed) Applications Snowmobile, Motocross, ATV Technical Information Always pre drill with 1/16 inchdrill bit for snowmobile tracks. Ease installing and in pre drilling we are sure we are going to be in the middle of the track and that we are going to go right. Add soap on the stud treads for better penetration. For a 120ftft track, you need about 180 studs For 137ftft track, you need about 200 studs For 144ftft track, you need about 250 studs For the pattern of a snowmobile track, take the toughest studs.