In this period of demonetisation SBI is offering credit card facilities for cashless purchases and to grab customers so that their turnover could increase. Previously it was very difficult to get a credit card from SBI but now they are giving it for free. You can also get it from shopping malls like bigbazar where SBI agents have opened stalls to lure customers.
SBI credit card is always in demand because it is the first one among all PSU banks to provide emi on credit card. Apart from that it also gives you bonus points for shopping, which you can later redeem to buy all types of products. I personally got my credit card from BigBazar and you get 30-50 days for repayment.