[Flutter] Problem with size of items in GridView in Flutter

The problem that occurs in GridView is that there is a space between the items that are created in the second row and later, as in the image below.

Item Widget:

return Material(
color: MyColors.Transparent,
child: Container(
margin: EdgeInsets.only(left: 3.5, right: 3.5),
width: 120,
child:
Column(
children: [
Card(
elevation: 0.9,
color: MyColors.Shadow,
child: InkWell(
radius: 30,
onTap: () {
AppController.Debug(Index);
},
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
mainAxisSize: MainAxisSize.min,
children: [
Image.network(
height: 50,
width: Variables.MATCH_PARENT,
"https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQ4xhc0rw70Yodsy2N2FKbxKJxCE8dAIG0sBA&s"),
SizedBox(
height: 7,
),
Container(
margin: EdgeInsets.symmetric(horizontal: 5),
child: Align(
alignment: Alignment.centerRight,
child: WiPersianText(
' Item $Index',
FontSize: 12,
IsBold: true,
IsSingleLine: true,
TextColor: MyColors.Black,
),
)),
SizedBox(
height: 6,
),
SizedBox(
height: 10,
)
],
))),
],
)


),
);


GridView:

Directionality(
textDirection: TextDirection.rtl,
child: GridView.count(
crossAxisCount: 4,
children: items)),

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