Specifications:

3060-20 gravel and cobblestone add fertilizer to increase impact resistance

3060-22 weathered rock limestone 50 MPa

3060-25 limestone hard rock 80 MPa

3060-25 alloy bean 12-grain Pebble granite protection matrix 80 MPa

3060-28 granite hard rock

3060-30 granite hard rock 120 MPa

Round seat fully hardened spring steel

Square seat fully hardened spring steel