1. Material-CR-V alloy steel.
2. Finishing-chrome plated.
1. 6600B/6600A-B: long arm with ball point type: (1) 27-660015B-77 long ball point hex key: 1.5x77mm(L). (2) 27-660002B-83 long ball point hex key: 2x83mm(L). (3) 27-660025B-90 long ball point hex key: 2.5x90mm(L). (4) 27-660003B-98 long ball point hex key: 3x98mm(L). (5) 27-660004B-106 long ball point hex key: 4x1.6mm(L). (6) 27-660005B-118 long ball point hex key: 5x118mm(L). (7) 27-660006B-137 long ball point hex key: 7x137mm(L). (8) 27-660008B-156 long ball point hex key: 8x156mm(L). (9) 27-660010B-170 long ball point hex key: 10x170mm(L). (10) 27-660003BA-90 long ball point hex key: 3/32x90mm(L). (11) 27-660004BA-98 long ball point hex key: 1/8x98mm(L). (12) 27-660005BA-106 long ball point hex key: 5/32x106mm(L). (13) 27-660006BA-118 long ball point hex key: 3/16x118mm(L). (14) 27-660007BA-128 long ball point hex key: 7/32x128mm(L). (15) 27-660008BA-137 long ball point hex key: 1/4x137mm(L). (16) 27-660010BA-156 long ball point hex key: 5/16x156mm(L). (17) 27-660012BA-170 long ball point hex key: 3/8x170mm(L). 2. 6600B-A: extra long arm with ball point type: (1) 27-660015B-90: 1.5x90mm(L). (2) 27-660002B-100: 2x100mm(L). (3) 27-660025B-112: 2.5x112mm(L). (4) 27-660003B-126: 3x126mm(L). (5) 27-660004B-140: 4x140mm(L). (6) 27-660005B-160: 5x160mm(L). (7) 27-660006B-180: 6x180mm(L). (8) 27-660007B-190: 7x190mm(L). (9) 27-660008B-200: 8x200mm(L). (10) 27-660010B-224: 10x224mm(L).