Comments - BINARY
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To be more clear: it can store binary values, not only characters:
create table bintest (id binary(5));
insert into bintest(id) values (x'0000000034');
insert into bintest(id) values (x'0031000034');
insert into bintest(id) values (x'0031003400');
insert into bintest(id) values (x'34');
MariaDB [xxx]> select hex(id) from bintest;
+------------+
hex(id)
+------------+
0000000034
0031000034
0031003400
3400000000
+------------+
4 rows in set (0.001 sec)