supply of ( i ) battery operated rail core drill machine ( ii ) rail twist drill ( i ) battery operated rail core drill machine ( ii ) rail twist drill, supply of battery operated rail core drill machine ( eibenstock make erd35-2-v50.4 b or similar ) as per rdso specification no. tm / sm / 468 dated 31.03.2014 first revision, 2017 or latest. suitable clamp for 52 kg and 60 kg rail to be supplied along with each machine. the suitable drill bit for sizes 7.2 mm ( solid drill ) , 13 mm ( rail hss cutter ) , 14mm ( rail hss cutter ) , 16mm ( rail tct cutter ) , 22 mm ( rail tct cutter ) to be included as standard accessory in each machine. , supply of rail twist drill size -13 x93 mm suitable for item no. 1. , supply of rail twist drill, size: 14 x 93mm suitable for item no. 1.