(1)LONGJER NO: LTM-S MAGNETIC BLOCK (S-TYPE)*Mag. force : 10 kg *Size:51*60*11.5mm (W*H*T) (2)LONGJER NO :LTM-M MAGNETIC BLOCK(M-TYPE)*Mag. force : 20 kg *Size:158 * 102 * 19mm. (W*H*T) *W/center hole.