Polished Surfaced.
Other Details:

Type	Thread (G)*	ØB	H	C	ØQ	ØR	SW	Weight (kg)
QD05MC-NN	3/8"	11	57	53	35	26	22	00,8
QD05MD-NN	½"	15	63	59	39	32	25	0,10
QD05ME-NN	¾"	20	75	70	49	41	32	0,22
QD05MF-NN	1"	25	79	73	55	47	38	0,26
QD05MG-NN	1¼"	35	84	79	63	57	49	0,35
QD05MH-NN	1½"	40	84	79	71	72	53	0,50
QD05MI-NN	2"	52	101	97	85	83	68	0,75